I have an old CTX LCD Monitor, model S501BA. It requires an AC adapter which I don't have. The label state that it requires a 12V 3A (_____ over -----) I need to know if the pos. or neg. is on the center post. Anyone able to help out?

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Cherryl, You could try local stores that sell computers and electronics, Walmart, the source, staples etc. Check the attached links,for power pack/charger, Good luck
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You will need at least a 4 amp rated regulated 12 Volt power supply.These are commercialy available from most electronics parts suppliers.They come on a circuit board. You can mount it in your own case anduse the original Viewsonic wire end. If you do a google search for 12volt reglated power supplies you should find many of these.

However, with a second-hand Sprint AC adapter with 3A,12v adapter, the screen blinks on and offintermittently. Obviously there is some difference here between a class2 adapter and a power supply box.